Fix spacing with nested enum in var_dump

Author: iluuu1994

Zend/tests/enum/var_dump-nested.phpt

@@ -0,0 +1,20 @@
+--TEST--
+Enum var_dump nested
+--FILE--
+<?php
+
+enum Foo {
+    case Bar;
+}
+
+var_dump([[Foo::Bar]]);
+
+?>
+--EXPECT--
+array(1) {
+  [0]=>
+  array(1) {
+    [0]=>
+    enum(Foo::Bar)
+  }
+}

ext/standard/var.c

@@ -605,7 +605,7 @@ PHPAPI void php_var_export_ex(zval *struc, int level, smart_str *buf) /* {{{ */
 			if (myht) {
 				zend_release_properties(myht);
 			}
-			if (level > 1) {
+			if (level > 1 && !is_enum) {
 				buffer_append_spaces(buf, level - 1);
 			}
 			if (ce == zend_standard_class_def) {